Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:1.7.1.2 (
nitrate reductase
)
3,861
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
The influence of varying levels of salinity (0, 100, 200 and 400 mM) on the activities of
nitrate reductase
(NR, E.C. 1.6.6.1), acid phosphatase (
ACP
, E.C. 3.1.3.2), and alkaline phosphatase (ALP, EC 3.1.3.1 ) as well as on nitrate and phosphate uptake and total nitrogen levels in leaves of a true mangrove Bruguiera parviflora was investigated under hydroponic culture conditions. NR activity increased in 100mM NaCl treated plants, whereas it decreased gradually in 200 and 400 mM treated plants, relative to the controls. Decreased activity of NR by NaCl stress was also accompanied by a decrease in total nitrogen level and nitrate uptake. Decreases in NR activity, nitrate (NO3-), and total nitrogen level due to high salinity may be responsible for a decrease in growth and biomass production in this plant. However, salinity caused an increase in both
ACP
and ALP activity. Activity staining of
ACP
by native polyacrylamide gel electrophoresis revealed three isoforms:
ACP
-1,
ACP
-2, and ACP-3. We observed a preferential enhancement in the ACP-3 isoform by salinity. In order to understand whether the salinity-induced increase in phosphatase activity was due to inhibition in phosphate uptake, we monitored phosphate (Pi) levels in leaves and noted that phosphate levels decreased significantly under salinity. These results suggest that the induction of acid and ALP under salt stress may be due to a phosphorous deficiency.
...
PMID:Effects of NaCI stress on nitrogen and phosphorous metabolism in a true mangrove Bruguiera parviflora grown under hydroponic culture. 1538 3
The non-point source pollution of drinking water source areas is a global issue which is mainly caused by unreasonable management of the commercial forests growing in the upstream areas. However the occurrence and specific mechanism of runoff pollution in these areas have not been approached. In order to clarify the factors influencing the non-point source pollution in the area, the test plot in Fushi Reservoir watershed covered by Phyllostachys edulis plantations with pure and modified stands was chosen, and the characteristics of soil chemical properties, enzyme activities and the coupling between soil factors and surface runoff of were initially analyzed, the relationship between soil factors and surface runoff pollutants was examined using redundancy analysis. The results showed that pH, soil
nitrate reductase
(S-NR) and catalase (S-CAT) were the key factors affecting the differentiation of water quality in surface runoff. The total nitrogen (TN) concentration in surface runoff was positively correlated with S-NR but negatively correlated with pH, TN and alkali-hydrolyzed nitrogen (AN) concentrations in soil. The total phosphorus (TP) concentration was negative correlation with soil pH and TP. In addition, the permanganate index (COD
Mn
) concentration has positive correlation with urease (S-UE), acid phosphatase (S-
ACP
) and organic matter (SOM) in soil. These results suggest that soil enzyme activities are more sensitive than soil nutrient status, and could be used as indicators of non-point source pollution assessing. Moreover, pollution in this area could be effectively controlled by enhancing vegetation coverage and ameliorating soil environment.
...
PMID:Coupling of non-point source pollution and soil characteristics covered by Phyllostachys edulis stands in hilly water source area. 3251 Apr 28
